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// Wedding Crash-OH NO YOU DON'T 
// Story: Unintended Consequences 
// by Daedalus 
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   Twilight Sparkle and friends, which included the Man 6 that were not Karkat or children, were having a picnic. Then Twilight got a letter about her brother that no one knew about except her and the 2 men in the world. Also Spike, but no one likes Spike. Except for me. It also informed everyone that Karkat was heading security for the event, as Equestria's military was a joke. Aristotle decided to visit, knowing that Karkat was a trouble magnet, and Aristotle wanted to field test his new cyborg body. 
At Canterlot, Shining Armor was touring the local strip joints as part of his stag party, so only the bride and Karkat were there to meet them. Twilight decided she was an imposter, but Karkat told her everything was under control. Eventually, Twilight was vindicated, so Karkat, who'd been able to see through the bug-pony-succubus-vampire's disguise the whole time, cowed the imposter with a display of the power he'd gotten from the Equestria of Future Past. Aristotle went with the Mane 6 to mop up the army. Celestia still got Worfed, unfortunately, so Karkat mocked her for a while before remembering he had some business to take care of up north and wouldn't be back for at least several weeks, so he left. Aristotle's cyborg body worked very well, as it happened.